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G HALL & W. H. WRIGHT. SUGAR SAP EVAPORATOR.

N0. 415,635. Patented NOV. 19, 1889.

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CLARK llALL AND XVILLIAM HENRY XVRIGIIT, OF EAST FARNHAM, QUEBEC, CANADA.

SUGAR-SAP EVAPO RATO R.

SPECIFICATION forming part of Letters Patent No. 415,635, dated November 19, 1889. Application filed February 1, 1889. Serial No. 298,312. (N model.) Patented in Canada March 7, 1888, No- 28,644-

To all whom it may concern:

Be it known that we, CLARK HALL and EVIL- LIAM HENRY WRIGHT, .residingat East Farnham, in the Province of Quebec, Canada, have invented certain new and useful Improvements in Sugar-Sap Evaporators; (for which we have obtained a patent in Canada, No. 28,644, dated March 7, 1888;) and we do hereby declare the following to be a full, clear, and

I0 exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention consists of the combination, with an evaporating-pan provided with a cross-partition having openings at each end and compartments on each side of said partition communicating at alternate ends, of, first, an elevated heater, in which the sap is heated to the boiling-point by the waste steam before bcingintroduced into the evaporator; and, second, of a reversible spout connected. with the heater, whereby the circulation of the sap may be reversed at pleasure during the process of evaporation.

The object of our invention is to provide increased evaporating-surface to prevent the accumulation of niter on the bottom of the siruping-down compartment, and to provide an evaporator which can easily be kept clean, and thus avoid the risk of burning when niter is beginning to accumulate on the bottom of the pan.

Referring to the drawings, Figure 1 is a side perspective view of an evaporator em bodying our improvements, and Fig. 2 is an end perspective view of the same.

The evaporating-pan A is made of tin, galvanized iron, or other suitable material, and is divided into two parts or compartments by the cross-partition B. The first part or compartment of this evaporating-pan is again subdivided by an odd number of longitudinal guides or partitions C, which have openings D at alternate ends, for the purpose of communication between the sub-compartments thus formed. The guides orpartitions nearest the sides of the evaporating pan have their openings at the end opposite the cross-partition 13. The larger portion of the bottom of the rear half of the evaporatingpan is provided with longitudinal recesses 01' channels E, which extend nearly the whole length of this said rear part, and also wit-h longitudinal partitions or guides F, correspondin g in number with the guides C in the front part. These guides F are provided with openings G at alternate ends for the purpose of communication between the suboompartments thus formed. The two outside sub-compartments M M of this rear half of the evaporator have plain fiat bottoms, each divided into two parts by partitions H H, having holes or openings I I, which are closed by slides K K, when necessary. The cross-partition 13 is provided with openings L L, at its opposite ends, to permit the flow of sap from and to each half of the evaporator alternately. Openings or pipes are provided at P P, for drawing off the sirup when ready.

The heater N, shaped like a small ordinary evaporator, with plain guides n, is placed over the inner end of the rear half of the evaporator, resting upon the guides F F, to which it is secured, and next to the cross-partition B, to which it is also secured. It is provided with an opening, in which is fitted a movable or reversible spout O, for conducting theheated sap to the one or the other of the smaller divisions of the sub-compartments M M, as may be desired.

The mode of operation is as follows: The sap, conveyed in the usual manner to the heater N, is heated to boiling-point by the steam arising from the boiling sap in the rear half of the evaporator and conveyed by the spout O to either of the small divisions of the sub-compartments M M. Referring to Fig. 2, it will be seen that the sap is c011- veyed to the small divisions of the compart- 9o ment M. The slide K being closed and the slide K open, the circulation is in the direction of the arrows, passing from the rear to the front half of evaporator by the opening L, and again by L to sub-compartment M, from whence it passes in the form of sirup by the pipe P. If niter should appear to be forming on the bottom of sub-compartment M, the circulation of sap must be reversed by moving the spout 0 over to the small 1'00 division of sub-compartment M, closing the slide Kand opening K,Which will be readily comprehended on reference to Fig. 1. The sap Will then move in the direction opposite to that indicated by the arrows in Fig. 2, wash Whatever niter may have formed on the bottom of M, and pass off as sirup at the opening P.

We make no claim to the evaporator as such, for we are aware that that is not new; but

What We claim as ourinvention,and desire to secure by Letters Patent, is

The hereinbefore-described evaporating apparatus comprising the evaporating-pan provided With the erosspartition B, dividing the evaporating-pan into two compartments, and having openings at its opposite ends, the longitudinal partitions C, dividing the front compartments of the pan into a series of sub-compartments, and having openings D at alternate ends, the longitudinal channels E, in the bottom of the rear compartment of the evaporating pan, the partitions F, subdividing the said rear compartment, the end compartments M M, having plain bottoms, the partitions II 11', again subdividing compartments M M and having openings I I, and the slides K K, for closing the openings I I, the elevated heater N, placed over the rear compartment, and the reversible spout 0, all combined and operating substantially as and for the purposes described.

In testimony whereof We affix our signatures in presence of two Witnesses.

CLARK HALL. WILLIAM HENRY VVRIGIIT. Witnesses:

J AS. I. BULMAN, H. THos. DUFFY. 

